February 1934 Yamamoto Trading Company was founded with capital of 0.5 million yen, and the company obtained the exclusive distributorship of the German machine tools to import and sell them in Japan.
September 1941 Company name was changed to Yamamoto & Co., Ltd. Its plant, current Tokyo Plant, was built in Koganei City, Tokyo and started manufacturing and marketing precision cutting tools.
August 1951 Company name was changed to Koganei, Ltd. and started manufacturing and marketing super finishing machines.
December 1958 Koganei started manufacturing hard metal deep boring tools (BTA tools).
August 1961 Koganei constructed Komagane Plant in Komagane City, Nagano prefecture.
August 1962 Humphrey Products in US and Koganei signed their technical licensing agreement on air valves.
March 1987 Koganei started fluororesin products business for semi conductor industry.
May 1990 A local subsidiary Taiwan Tun Kuang Industry Co., Ltd. was founded in Taipei, Taiwan.
February 1991 K... [more]